How To Sister Attic Joists

Driving 16d common nails in old hard wood is difficult.

How to sister attic joists.

How to reinforce an attic floor with sister joists clear the joist spaces pull out all insulation and any debris from all of the joist spaces so you can see the full. If you want to play it safe not being required to double the joists you can just sister on the same size board getting as close to the end of the rafter as you can. Take some extra time and jack the damaged area up so that the new lumber doesn t need to be. Insulate basement rim joists.

Run the rows parallel and an inch. Measure the old joists measure the length of the old joists and note how much they overhang any supporting walls or. Then attach the sister joist using three 16d common nails driven every 16 in. A single rafter on each side is allowed per irc rules up to 48 between the two supporting rafters.

Predrill and drive 3 8 in. Hope this helps wg. Lag screws if you re having trouble nailing. Make two rows of nails spaced 16 inches or less apart along the length of the sister.

Nail 10d or 16d common nails through the sister and into the existing joist. You will be exceeding the rule for minimum.